Ha and Hour angle

Ha noun - (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day.

Hour angle and ha are semantically related. In some cases you can use "Hour angle" instead a noun "Ha".

Hour angle noun - (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day.

Ha and hour angle are semantically related. You can use "Ha" instead a noun phrase "Hour angle".